Around 3 million people rely on pacemakers to keep their hearts beating. Chances are, someone in your immediate or extended family, or even in your circle of friends, has one of these devices regulating their heart rhythms. What would happen if that device suddenly stopped working?

The results would be devastating. It's frightening enough to think about on its own, but when you add cybercrime into the mix, it gets even scarier.

We warn you about hacks and breaches on a daily basis. Those security threats typically target your smartphone, tablet or personal computer. Or, sometimes they're Facebook scams or fraudulent emails. This threat, however, takes cybercrime to a whole new level.

Muddy Waters, a private equity firm that specializes in research, recently released a report that expressed serious concerns over the safety of pacemakers manufactured by St. Jude Medical. In fact, the concerns were so significant the report even suggests that the products be "recalled and remediated."

According to Muddy Waters' research, these pacemakers are vulnerable to two types of cyberattacks that can cause the device to malfunction, drain the battery or shut off completely.